这是我的第一个SQLite应用程序，我发现了很多错误，我不知道该怎么做。
谁能告诉我我需要做什么？
这是我的日志猫：
12-26 18:58:05.870 26185-26185/? I/art: Late-enabling -Xcheck:jni
12-26 18:58:05.889 26185-26185/? E/Environment: initForCurrentUser:userId= 0
12-26 18:58:05.889 26185-26185/? D/Environment: UserEnvironment current
userId IS : 0
12-26 18:58:05.889 26185-26185/? D/Environment: UserEnvironment PRIMARY
STORAGE IS : MEDIA_INTERNAL
12-26 18:58:05.982 26185-26185/com.example.acer.sqlitecrud I/LoadedApk: No
resource references to update in package com.hmct.hmcttheme
12-26 18:58:06.010 26185-26185/com.example.acer.sqlitecrud W/art: Before
Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
12-26 18:58:06.135 26185-26185/com.example.acer.sqlitecrud E/SQLiteLog: (1)
near "TABLEstudentTable": syntax error
12-26 18:58:06.136 26185-26185/com.example.acer.sqlitecrud D/AndroidRuntime:
Shutting down VM
12-26 18:58:06.138 26185-26185/com.example.acer.sqlitecrud E/AndroidRuntime:
FATAL EXCEPTION: main
Process: com.example.acer.sqlitecrud, PID: 26185
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.acer.sqlitecrud/com.example.acer.sqlitecrud.MainActivity}: android.database.sqlite.SQLiteException: near "TABLEstudentTable": syntax error (code 1): , while compiling: CREATE TABLEstudentTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2328)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2394)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5270)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:913)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:708)
Caused by: android.database.sqlite.SQLiteException: near "TABLEstudentTable": syntax error (code 1): , while compiling: CREATE TABLEstudentTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1605)
at com.example.acer.sqlitecrud.DatabaseHelper.onCreate(DatabaseHelper.java:27)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.acer.sqlitecrud.DatabaseHelper.<init>(DatabaseHelper.java:22)
at com.example.acer.sqlitecrud.MainActivity.onCreate(MainActivity.java:22)
at android.app.Activity.performCreate(Activity.java:6075)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2281)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2394)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5270)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:913)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:708)
12-26 18:58:06.249 26185-26185/com.example.acer.sqlitecrud I/Process: Sending signal. PID: 26185 SIG: 9
这是我的班级：
database helper.Java
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String dbName = "Student.db";
public static final String tbName = "studentTable";
public static final String colID = "ID";
public static final String colName = "NAME";
public static final String colMarks = "MARKS";
public DatabaseHelper(Context context) {
super(context, dbName, null, 1);
SQLiteDatabase db = this.getWritableDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE"+tbName+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS"+tbName);
onCreate(db);
}
public boolean insertData (String Name, String Marks){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(colName,Name);
contentValues.put(colMarks,Marks);
long result = db.insert(tbName,null,contentValues);
if (result == -1){
return false;
}else {
return true;
}
}
}
main activity.Java:
package com.example.acer.sqlitecrud;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
DatabaseHelper myDb;
EditText Name, Marks;
Button addData;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDb = new DatabaseHelper(this);
Name = (EditText)findViewById(R.id.edtNama);
Marks = (EditText)findViewById(R.id.edtNilai);
addData = (Button)findViewById(R.id.btnInsert);
InsertData();
}
private void InsertData() {
addData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isInserted = myDb.insertData(Name.getText().toString(),
Marks.getText().toString());
if (isInserted = true){
Toast.makeText(MainActivity.this,"Data Telah Di Inputkan !!",Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(MainActivity.this,"Data Gagal Di Inputkan !!",Toast.LENGTH_SHORT).show();
}
}
});
}
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE "+tbName+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)");
}
注意TABLE和tbName之间的空格
查询语法错误，缺少空间。
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE "+tbName+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)");
}
您在create table的语法中缺少空格
db.execSQL("CREATE TABLE "+tbName+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)");
在下拉表中你也错过了空间
"DROP TABLE IF EXISTS "+tbName
检查以下代码
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE "+tbName+"(ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, MARKS INTEGER)"); //add space after TABLE
}